let select = document.querySelectorAll('.select');
for (let i = 0; i < select.length; i++) {
    select[i].onmouseover = function () {
        let more = this.children[1];
        more.style.display = 'block';
    }
    select[i].onmouseout = function () {
        let more = this.children[1];
        more.style.display = 'none';
    }
}